| ( | 12 | − | 6 | ) | × | 10 | = | 12 100 | ( | 12 | − | 10 | ) | X |
| Left side of the equation = | 12 | × | 10 | − | 6 | × | 10 |
| = | 120 | − | 60 |
| = | 60 |
| 60 | = | 12 100 | ( | 12 | − | 10 | ) | X |
| Right side of the equation = | 12 100 | × | 12 | X | − | 12 100 | × | 10 | X |
| = | 36 25 | X | − | 6 5 | X |
| = | 6 25 | X |
| 60 | = | 6 25 | X |
| - | 6 25 | X | = | - | 60 |
| 60 | = | 6 25 | X |
6 25 | X | = | 60 |
| X | = | 60 | ÷ | 6 25 |
| = | 60 | × | 25 6 |
| = | 10 | × | 25 |
| X | = | 250 |